Communication method and communications apparatus

ABSTRACT

A communication method and a communications apparatus are disclosed. The method is performed by a control plane function entity and includes: obtaining a correspondence between address information of a user plane function entity and a user plane capability supported by the user plane function entity; receiving a request message from an application server, where the request message is used to request to establish a session for a first service and includes service information of the first service, and the service information includes at least one of broadcast area information and service type information; determining address information of a target user plane function entity based on the correspondence and the service information; and establishing a session connection to the target user plane function entity based on the address information.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Application No.PCT/CN2016/107649, filed on Nov. 29, 2016, the disclosure of which ishereby incorporated by reference in its entirety.

TECHNICAL FIELD

This application relates to the field of wireless communications, and inparticular, to a communication method and a communications apparatus.

BACKGROUND

Internet of Vehicles communications are a hot trend in development ofcommunications technologies, for the purpose of researching andstandardizing V2X (Vehicle to Everything) technologies based on LTE(Long Term Evolution). As shown in FIG. 1, an application scenario of aV2X service includes V2V (vehicle to vehicle) communications, V21(vehicle to infrastructure) communications, and V2P (vehicle topedestrian) communications. The V2X service is mainly implemented bybroadcasting a V2X message.

In a current system, an MBMS (multimedia broadcast multicast system)architecture with separation between a CP (control plane) function and aUP (user plane) function is proposed in an LTE system, and as shown inFIG. 2, includes a BM-SC (broadcast multicast service center), anMBMS-GW (multimedia broadcast multicast system gateway), and an LME(local broadcast entity). A control plane function entity is configuredin the BM-SC and the MBMS-GW, and a user plane function entity isconfigured in the LME. In addition, the user plane function is close toa base station, control plane functions of the BM-SC and the MBMS-GW areretained on a control plane function entity in a core network, and theuser plane function entity and the control plane function entity areconnected and interact with each other through a newly defined Mvinterface.

In the foregoing architecture with separation between the user planefunction and the control plane function, the control plane functionentity establishes a session connection to a particular user planefunction entity in a preconfigured manner. The particular user planefunction entity may have a coverage area or service limitation. As aresult, a service requirement of an application server fails to be met,and service quality is affected.

SUMMARY

This application provides a communication method and a communicationsapparatus, so as to resolve the following problem: How does a controlplane function entity establish a session connection to a user planefunction entity in an MBMS architecture with separation between functionentities, to meet a service requirement of an application server?

According to a first aspect, this application provides a communicationmethod. The method includes obtaining, by a control plane functionentity, a correspondence between address information of a user planefunction entity and a user plane capability supported by the user planefunction entity. The method also includes receiving, by the controlplane function entity, a request message sent by an application server,where the request message is used to request to establish a session fora first service, the request message includes service information of thefirst service, and the service information includes at least one ofbroadcast area information and service type information. The method alsoincludes determining, by the control plane function entity, addressinformation of a target user plane function entity based on thecorrespondence and the service information. The method also includesestablishing, by the control plane function entity, a session connectionto the target user plane function entity based on the addressinformation of the target user plane function entity.

This aspect provides a relatively flexible method for connectingfunction entities. The control plane function entity pre-establishes thecorrespondence between the address information of the user planefunction entity and the user plane capability, so that after receivingthe request message sent by the application server, the control planefunction entity can determine, based on the service information, forexample, the broadcast area information or the service type information,in the request message, address information of a user plane functionentity providing a service, and establish a session connection.Therefore, a user plane function entity is flexibly selected based on aservice requirement of the first service, service limitations of anapplication server caused by a preconfigured manner in the currentsystem are avoided, and service quality is improved.

With reference to the first aspect, in an implementation, thedetermining, by the control plane function entity, address informationof a target user plane function entity based on the correspondence andthe service information includes: determining, by the control planefunction entity, a user plane capability of the target user planefunction entity based on the service information; and searching, by thecontrol plane function entity, the correspondence based on thedetermined user plane capability, to determine the address informationof the target user plane function entity.

With reference to the first aspect, in an implementation, the controlplane function entity includes at least one of a broadcast multicastservice center (BM-SC) control plane function entity and a multimediabroadcast multicast system gateway MBMS-GW control plane functionentity.

With reference to the first aspect, in an implementation, the controlplane function entity includes a BM-SC control plane function entity andan MBMS-GW control plane function entity; the determining, by thecontrol plane function entity, address information of a target userplane function entity based on the correspondence and the serviceinformation includes: determining, by the BM-SC control plane functionentity, the address information of the target user plane function entitybased on the correspondence and the service information; and theestablishing, by the control plane function entity, a session connectionto the target user plane function entity based on the addressinformation of the target user plane function entity includes: sending,by the BM-SC control plane function entity, a session start request tothe MBMS-GW control plane function entity, where the session startrequest includes the address information of the target user planefunction entity; and establishing, by the MBMS-GW control plane functionentity, a session connection to the target user plane function entitybased on the address information of the target user plane functionentity.

With reference to the first aspect, in an implementation, the controlplane function entity is an MBMS-GW control plane function entity, andthe receiving, by the control plane function entity, a request messagesent by an application server includes: receiving, by the MBMS-GWcontrol plane function entity by using a BM-SC control plane functionentity, the request message sent by the application server.

With reference to the first aspect, in an implementation, the broadcastarea information includes a cell identity (cell ID), a service areaidentifier (SAI), or geographical location information; and the servicetype information includes a mobile broadband MBB service, an Internet ofThings (IoT) service, an ultra-reliable and low latency communications(URLLC) service, or an emergency call (MCPTT) service.

According to a second aspect, this application provides a communicationsapparatus. The apparatus is a control plane function entity, including:an obtaining unit, configured to obtain a correspondence between addressinformation of a user plane function entity and a user plane capabilitysupported by the user plane function entity; a transceiver unit,configured to receive a request message sent by an application server,where the request message is used to request to establish a session fora first service, the request message includes service information of thefirst service, and the service information includes at least one ofbroadcast area information and service type information; and aprocessing unit, configured to: determine address information of atarget user plane function entity based on the correspondence obtainedby the obtaining unit and the service information received by thetransceiver unit, and establish a session connection to the target userplane function entity based on the address information of the targetuser plane function entity.

With reference to the second aspect, in an implementation, theprocessing unit is further configured to: determine a user planecapability of the target user plane function entity based on the serviceinformation; and search the correspondence based on the determined userplane capability, to determine the address information of the targetuser plane function entity.

With reference to the second aspect, in an implementation, the apparatusincludes at least one of a broadcast multicast service center (BM-SC)control plane function entity and a multimedia broadcast multicastsystem gateway (MBMS-GW) control plane function entity.

With reference to the second aspect, in an implementation, the apparatusincludes a BM-SC control plane function entity and an MBMS-GW controlplane function entity, the processing unit includes a first processingunit and a second processing unit, the BM-SC control plane functionentity includes the transceiver unit, the obtaining unit, and the firstprocessing unit, and the MBMS-GW control plane function entity includesthe second processing unit, where the first processing unit isconfigured to: determine the address information of the target userplane function entity based on the correspondence and the serviceinformation, and send a session start request to the MBMS-GW controlplane function entity by using the transceiver unit, where the sessionstart request includes the address information of the target user planefunction entity; and the second processing unit is configured toestablish a session connection to the target user plane function entitybased on the address information of the target user plane functionentity.

With reference to the second aspect, in an implementation, the apparatusincludes a BM-SC control plane function entity and an MBMS-GW controlplane function entity, and the BM-SC control plane function entityincludes the transceiver unit, where the transceiver unit is configuredto send the received request message to the MBMS-GW control planefunction entity.

With reference to the second aspect, in an implementation, the broadcastarea information includes a cell identity (cell ID), a service areaidentifier (SAI), or geographical location information; and the servicetype information includes a mobile broadband (MBB) service, an Internetof Things (IoT) service, an ultra-reliable and low latencycommunications URLLC service, or an emergency call (MCPTT) service.

According to a third aspect, this application further provides acommunications interface, where the communications interface isconfigured to connect a user plane function entity and a control planefunction entity, to implement a session connection between the userplane function entity and the control plane function entity.

According to a fourth aspect, this application further provides acommunications system, including: an application server, a control planefunction entity, and a target user plane function entity, where thecontrol plane function entity is configured to send a session connectionrequest to the target user plane function entity; the application serveris configured to send a request message to the control plane functionentity, where the request message is used to request to establish asession for a first service, the request message includes serviceinformation of the first service, and the service information includesat least one of broadcast area information and service type information;the control plane function entity is configured to: obtain acorrespondence between address information of a user plane functionentity and a user plane capability supported by the user plane functionentity, and receive the request message sent by the application server;and the control plane function entity is further configured to:determine address information of the target user plane function entitybased on the correspondence and the service information, and establish asession connection to the target user plane function entity based on theaddress information of the target user plane function entity.

With reference to the fourth aspect, in an implementation, the targetuser plane function entity is configured to: receive the sessionconnection request sent by the control plane function entity, generate asession connection response based on the session connection request, andsend the session connection response to the control plane functionentity, to establish a session connection. In addition, the controlplane function entity is further configured to implement any one of thefirst aspect or the implementations of the first aspect.

According to a fifth aspect, this application further provides acomputer storage medium, configured to store a computer softwareinstruction used for the foregoing communication method, and thecomputer software instruction includes a program designed to perform theforegoing aspects.

This application provides a communication method. The control planefunction entity searches, based on the service information of the firstservice, the correspondence between the address information of the userplane function entity and the user plane capability supported by theuser plane function entity, to determine the target user plane functionentity; and establishes a session connection to the target user planefunction entity, so as to provide a service for the first service.Therefore, a user plane function entity is flexibly selected based on aservice requirement of the first service, service limitations of anapplication server caused by a preconfigured manner in the currentsystem are avoided, and service quality is improved.

BRIEF DESCRIPTION OF THE DRAWINGS

To describe technical solutions of this application more clearly, thefollowing briefly describes the accompanying drawings required fordescribing the embodiments.

FIG. 1 is a schematic diagram of an application scenario of a V2Xservice according to this application;

FIG. 2 is a schematic diagram of an MBMS architecture with separationbetween a control plane function entity and a user plane function entityaccording to this application;

FIG. 3 is a schematic flowchart of a communication method according tothis application;

FIG. 4 is a signaling flowchart of a communication method according tothis application;

FIG. 5 is a signaling flowchart of another communication methodaccording to this application;

FIG. 6 is a schematic structural diagram of a control plane functionentity according to this application;

FIG. 7 is a schematic structural diagram of another control planefunction entity according to this application; and

FIG. 8 is a schematic structural diagram of still another control planefunction entity according to this application.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

Embodiments of this application may be applied to an MBMS architecturewith separation between a control plane function entity and a user planefunction entity, and further, the MBMS architecture may be applied tovarious communications systems, for example, an LTE system or otherwireless communications systems using various radio access technologies.

To resolve the foregoing technical problem, this application providesthe following embodiments. Each embodiment includes an applicationserver (AS), a control plane function entity, and at least one userplane function entity. Each user plane function entity supports one ortwo user plane capabilities, and the user plane capability may be abroadcast area capability or a service type capability or the likesupported by the user plane function entity. The application server isconfigured to initiate a request to the control plane function entity,so as to activate an MBMS bearer.

FIG. 2 is a schematic diagram of an MBMS architecture with separationbetween a control plane function entity and a user plane functionentity. As shown in FIG. 2, to reduce a transmission delay in a corenetwork, the user plane function entity is disposed at a locationrelatively close to an evolved NodeB (eNB); the control plane functionentity is disposed in an overall CN MBMS, and the overall MBMS includesat least one control plane function entity, for example, a BM-SC controlplane function entity, an MBMS-GW control plane function entity, or anMCE (multicast control entity). In addition, the user plane functionentity and the control plane function entity may be connected through adefined Mv interface.

It should be noted that, the user plane function entity and the controlplane function entity mentioned in the embodiments of this applicationmay be independent physical devices, or may be disposed on an existingphysical device. This is not limited herein.

Embodiment 1

This application discloses a communication method, used to provide, foran application server, a user plane function entity supporting a servicerequirement of the application server. As shown in FIG. 3, the methodincludes the following steps.

Step 301: A control plane function entity obtains a correspondencebetween address information of a user plane function entity and a userplane capability supported by the user plane function entity.

The control plane function entity includes at least one of a BM-SCcontrol plane function entity and an MBMS-GW control plane functionentity.

The address information includes an IP address or an FQDN (fullyqualified domain name) or the like of the user plane function entity,and is used to identify the user plane function entity.

The user plane capability supported by the user plane function entityincludes a supported broadcast area, a supported service type, and thelike.

Specifically, broadcast area information may be used to indicate acoverage capability of the user plane function entity, namely, a rangeof service that can be provided by the user plane function entity, andmay include a cell identity (cell ID), a service area identifier (SAI),or geographical location information. The cell identity is used toidentify a cell, the service area identifier is used to identify aservice area, and the geographical location information may becoordinate information. This is not limited.

In addition, service type information may include a mobile broadband(MBB) service, an Internet of Things IoT service, an ultra-reliable andlow latency communications (URLLC) service, or a mission-criticalpush-to-talk (MCPTT) service.

Optionally, in step 301, that the control plane function entity obtainsthe correspondence is specifically implemented in the following manners.

Manner 1: The control plane function entity receives the correspondencesent by the user plane function entity.

Manner 2: The control plane function entity obtains the addressinformation of the user plane function entity and the user planecapability supported by the user plane function entity that are sent bythe user plane function entity, and establishes a correspondence betweenthe address information of the user plane function entity and the userplane capability supported by the user plane function entity.

Manner 3: The control plane function entity receives the user planecapability supported by the user plane function entity and an identifierof the user plane function entity that are sent by the user planefunction entity; and obtains the address information of the user planefunction entity based on the received identifier, so as to establish thecorrespondence. An address of the user plane function entity may beobtained by using a DNS (domain name system) server, and details are notdescribed.

Specifically, the foregoing correspondence includes a correspondencebetween address information of each user plane function entity in anMBMS system and a user plane capability supported by each user planefunction entity. For example, each IP address or FQDN corresponds to auser plane capability supported by one user plane function entity.

Step 302: The control plane function entity receives a request messagesent by an application server, where the request message is used torequest to establish a session for a first service, the request messageincludes service information of the first service, and the serviceinformation includes at least one of broadcast area information andservice type information.

The request message is used to initiate a session connection between thecontrol plane function entity and the user plane function entity, so asto provide a service for the application server. The request message mayfurther include information such as a TMGI (temporary group identity)and QoS (quality of service).

Step 303: The control plane function entity determines addressinformation of a target user plane function entity based on thecorrespondence and the service information.

Specifically, the control plane function entity determines, based on theat least one of the broadcast area information and the service typeinformation in the service information, a user plane capabilitysupported by the target user plane function entity; and then searchesthe correspondence based on the determined user plane capability, todetermine the address information of the target user plane functionentity.

Example 1

It is assumed that the service information of the first service carriesthe broadcast area information, and the broadcast area information isused to indicate a service range of the first service. After receivingthe service information, the control plane function entity determines abroadcast area of the target user plane function entity based on thebroadcast area information. The service range of the first service maybe a range in which the first service can be provided; and the broadcastarea of the target user plane function entity may be a range in whichthe target user plane function entity can provide a service. It shouldbe noted that, a coverage range of the target user plane function entityoverlaps the service range of the first service. In other words, thecoverage range of the target user plane function entity includes a partor all of the service range of the first service.

Specifically, if the service range of the first service is includedwithin a coverage capability of a first user plane function entity, thetarget user plane function entity is the first user plane functionentity; if the service range of the first service needs to be covered bycapabilities of at least two user plane function entities, the targetuser plane function entity is the at least two user plane functionentities.

Further, the control plane function entity searches the foregoingcorrespondence based on the coverage capability of the determined targetuser plane function entity, to obtain an address of the target userplane function entity.

Example 2

It is assumed that the service information of the first service carriesthe service type information. For example, a service type of the firstservice is an MBB service. The control plane function entity determinesthat the target user plane function entity supports an MBB servicecapability, searches for, based on the correspondence, a user planefunction entity supporting the MBB service capability, and uses the userplane function entity as the target user plane function entity. Anaddress, for example, an IP address or an FQDN, of the user planefunction entity is sent to the control plane function entity.Optionally, if at least two user plane function entities support the MBBservice capability, the control plane function entity determines to usethe at least two user plane function entities supporting the MBB servicecapability as target user plane function entities, and provides asession connection service.

Example 3

The service information of the first service includes the broadcast areainformation and the service type information, and the broadcast areainformation is used to indicate the service range of the first service.After receiving the service information, the control plane functionentity searches, with reference to Example 1 and Example 2, thecorrespondence for a user plane function entity that supports theservice range of the first service and the service type of the firstservice, to obtain an address of the user plane function entity found.The user plane function entity found is the target user plane functionentity.

Step 304: The control plane function entity establishes a sessionconnection to the target user plane function entity based on the addressinformation of the target user plane function entity.

Specifically, the control plane function entity sends a session startrequest message to the target user plane function entity, where adestination address of the message is the address of the target userplane function entity; and after receiving the session start requestmessage, the target user plane function entity feeds back a sessionstart response message to the control plane function entity, indicatingthat establishment of a session connection is allowed.

This embodiment provides a communication method. The control planefunction entity searches, based on the service information of the firstservice, the correspondence between the address information of the userplane function entity and the user plane capability supported by theuser plane function entity, to determine the target user plane functionentity; and establishes a session connection to the target user planefunction entity, so as to provide a service for the first service.Therefore, a user plane function entity is flexibly selected based on aservice requirement of the first service, service limitations of anapplication server caused by a preconfigured manner in the currentsystem are avoided, and service quality is improved.

Embodiment 2

As shown in FIG. 4, this application provides another communicationmethod. The method is performed by a control plane function entity. Thecontrol plane function entity includes a BM-SC control plane functionentity and an MBMS-GW control plane function entity. Specific steps ofthe method are as follows.

Step 401: The BM-SC control plane function entity obtains acorrespondence between address information of a user plane functionentity and a user plane capability supported by the user plane functionentity.

Step 401 may be specifically implemented in the manners described instep 301. In addition, for the address information and the user planecapability, refer to the related descriptions of the embodiment shown inFIG. 3, and details are not described again.

Step 402: The BM-SC control plane function entity receives a requestmessage sent by an application server.

The request message is used to request to establish a session for afirst service, the request message includes service information of thefirst service, and the service information includes at least one ofbroadcast area information and service type information.

For the broadcast area information and the service type information,refer to the related descriptions of the embodiment shown in FIG. 3, anddetails are not described again.

Step 403: The BM-SC control plane function entity determines addressinformation of a target user plane function entity based on thecorrespondence and service information.

Step 403 may be specifically implemented with reference to the relateddescriptions of step 303, and details are not described again.

Step 404: The BM-SC control plane function entity sends a session startrequest to the MBMS-GW control plane function entity, where the sessionstart request includes the address information of the target user planefunction entity.

The address information of the target user plane function entity may beinformation such as an IP address or an FQDN of the target user planefunction entity.

Step 405: The MBMS-GW control plane function entity receives the sessionstart request, and establishes a session connection to the target userplane function entity based on the address information of the targetuser plane function entity.

Specifically, after receiving the session start request sent by theBM-SC control plane function entity, the MBMS-GW control plane functionentity feeds back a session start response to the BM-SC control planefunction entity, where the session start response is used to indicatethat the MBMS-GW control plane function entity has received the addressinformation of the target user plane function entity. The MBMS-GWcontrol plane function entity sends a connection request message to thetarget user plane function entity, where a destination address of theconnection request message is an address of the target user planefunction entity. The target user plane function entity receives theconnection request message, and feeds back a response message to theMBMS-GW control plane function entity, where the response message isused to indicate that a connection is allowed and a service is allowedto be provided.

The session start response further includes information used to indicatethat the MBMS-GW control plane function entity successfully establishesa session connection to the target user plane function entity.

Optionally, the foregoing method further includes step 406. The BM-SCcontrol plane function entity sends a bearer response used to activatean MBMS bearer to the application server, so that the target user planefunction entity provides a service for the application server.

Further, the BM-SC control plane function entity is connected to thetarget user plane function entity through an My port.

In the communication method provided in this embodiment, the controlplane function entity includes the BM-SC control plane function entityand the MBMS-GW control plane function entity; the BM-SC control planefunction entity receives the request message and searches for a targetuser plane function entity that can provide the first service, and thenthe MBMS-GW control plane function entity establishes a sessionconnection to the target user plane function entity. In this way, thecontrol plane function entity flexibly selects, based on the serviceinformation sent by the application server, a user plane function entityproviding the first service, and failure to meet a requirement of thefirst service of the application server caused by using a preconfigureduser plane function entity in the current system is avoided.

Embodiment 3

As shown in FIG. 5, this application provides another communicationmethod. The method is performed by a control plane function entity. Thecontrol plane function entity includes a BM-SC control plane functionentity and an MBMS-GW control plane function entity. Specific steps ofthe method are as follows.

Step 501: The MBMS-GW control plane function entity obtains acorrespondence between address information of a user plane functionentity and a user plane capability supported by the user plane functionentity.

Step 502: The BM-SC control plane function entity receives a requestmessage sent by an application server, where the request message is usedto request to establish a session for a first service, the requestmessage includes service information of the first service, and theservice information includes at least one of broadcast area informationand service type information.

Step 503: The BM-SC control plane function entity forwards the requestmessage to the MBMS-GW control plane function entity.

Step 504: The MBMS-GW control plane function entity receives the requestmessage sent by the BM-SC control plane function entity, and determinesaddress information of a target user plane function entity based on theservice information in the request message and the correspondence.

Step 505: The MBMS-GW control plane function entity establishes asession connection to the target user plane function entity based on theaddress information.

The method provided in this embodiment further includes: feeding back,by the MBMS-GW control plane function entity, a session connectionresponse to the BM-SC control plane function entity, to notify the BM-SCcontrol plane function entity that a session is establishedsuccessfully.

Step 506: After receiving a session connection response, the BM-SCcontrol plane function entity sends a bearer response to the applicationserver.

It should be noted that, for both a noun and an implementation of a stepin the embodiment shown in FIG. 5, refer to the related descriptions ofthe embodiment shown in FIG. 3, and details are not described again.

As shown in FIG. 6, this application provides a communicationsapparatus. The apparatus is a control plane function entity. Theapparatus may be configured to perform steps performed by the controlplane function entity shown in FIG. 3, or may be configured to performactions performed by both the BM-SC control plane function entity andthe MBMS-GW control plane function entity in the embodiment shown inFIG. 4 or FIG. 5.

The apparatus includes a transceiver unit 601, a processing unit 602,and an obtaining unit 603.

The obtaining unit 603 is configured to obtain a correspondence betweenaddress information of a user plane function entity and a user planecapability supported by the user plane function entity.

The user plane capability includes at least one of a broadcast area anda service type.

The processing unit 602 may be implemented in the manners provided instep 301 in the embodiment shown in FIG. 3, and details are notdescribed again.

The transceiver unit 601 is configured to receive a request message sentby an application server.

The request message is used to request to establish a session for afirst service, the request message includes service information of thefirst service, and the service information includes at least one ofbroadcast area information and service type information.

The broadcast area information includes a cell identity (cell ID), aservice area identifier (SAI), or geographical location information, andthe service type information includes an MBB service, an IoT service, aURLLC service, an MCPTT service, or the like.

The processing unit 602 is further configured to: determine addressinformation of a target user plane function entity based on thecorrespondence obtained by the obtaining unit 603 and the serviceinformation received by the transceiver unit 601; and establish asession connection to the target user plane function entity based on theaddress information of the target user plane function entity.

Further, the processing unit 602 is further configured to: determine auser plane capability of the target user plane function entity based onthe service information; and search the correspondence based on thedetermined user plane capability, to determine the address informationof the target user plane function entity.

Optionally, the foregoing apparatus includes at least one of a BM-SCcontrol plane function entity and an MBMS-GW control plane functionentity.

In a possible implementation, as shown in FIG. 7, both the transceiverunit 601 and the obtaining unit 603 are located in the BM-SC controlplane function entity. The processing unit 602 includes a firstprocessing unit 6021 and a second processing unit 6022, where the firstprocessing unit 6021 is located in the BM-SC control plane functionentity, and the second processing unit 6022 is located in the MBMS-GWcontrol plane function entity.

In addition, the foregoing apparatus further includes a receiving unit604, where the receiving unit 604 is located in the MBMS-GW controlplane function entity.

The first processing unit 6021 is specifically configured to: determinethe address information of the target user plane function entity basedon the correspondence and the service information; and send a sessionstart request to the MBMS-GW control plane function entity, where thesession start request includes the address information of the targetuser plane function entity.

The receiving unit 604 is configured to receive the session startrequest sent by the first processing unit 6021.

The second processing unit 6022 is configured to establish a sessionconnection to the target user plane function entity based on the addressinformation of the target user plane function entity that is carried inthe session start request received by the receiving unit 604.

In another possible implementation, the transceiver unit 601 is locatedin the BM-SC control plane function entity, the obtaining unit 603 maybe located in the BM-SC control plane function entity or the MBMS-GWcontrol plane function entity, and the processing unit 602 is located inthe MBMS-GW control plane function entity.

The transceiver unit 601 is configured to receive the request messagesent by the application server, and send the request message to theMBMS-GW control plane function entity.

Optionally, the transceiver unit 601 is further configured to send abearer response used to activate an MBMS bearer to the applicationserver, so that the target user plane function entity provides a servicefor the application server.

Optionally, the foregoing apparatus may further include a storage unit,configured to store information such as the address information of thetarget user plane function entity, the service information of the firstservice in the request message, and the correspondence.

It should be noted that, for a noun or a terminology in the embodimentshown in FIG. 6 or FIG. 7, refer to the related descriptions of theembodiment shown in FIG. 3, and details are not described again.

The control plane function entity provided in this embodiment flexiblyselects, based on the broadcast area information or the service typeinformation that is provided by the application server, a proper userplane function entity to provide a service, so that flexibility inconfiguring a user plane function entity is improved, the user planefunction entity can meet a service requirement of the applicationserver, and service quality is improved.

In addition, this application further provides a user plane functionentity. A user plane capability supported by the user plane functionentity may include a broadcast area or a service type. For details,refer to the related descriptions of the embodiment shown in FIG. 3, anddetails are not described again.

The user plane function entity includes a transceiver unit and aprocessing unit.

The transceiver unit is configured to obtain a session connectionrequest sent by a control plane function entity. The processing unit isconfigured to: generate a session connection response based on thereceived session connection request, and send the session connectionresponse to the control plane function entity by using the transceiverunit, so that the transceiver unit establishes a session connection tothe control plane function entity.

This application further provides a control plane function entity,configured to receive a request message sent by an application server,search for a target user plane function entity, and establish a sessionconnection to the target user plane function entity. The control planefunction entity may be configured to perform actions performed by thecontrol plane function entity in the foregoing method embodiments.

As shown in FIG. 8, this application provides a communicationsapparatus. The apparatus is a control plane function entity. The controlplane function entity may include at least one of a BM-SC control planefunction entity and an MBMS-GW control plane function entity. Thecontrol plane function entity may be configured to perform actionsperformed by the control plane function entity or by the BM-SC controlplane function entity and the MBMS-GW control plane function entity inthe foregoing method embodiments.

Specifically, the control plane function entity includes acommunications interface 801, a processor 802, and a memory 803. Thecontrol plane function entity may also include more or less components,or some components may be combined, or different component arrangementsare used. This is not limited in this application.

The communications interface 801 may include at least one communicationsinterface configured to connect a user plane function entity and acontrol plane function entity, for example, an My interface and an Muinterface. The Mv interface is configured to connect an MBMS-GW controlplane function entity and an MBMS-GW user plane function entity; and theMu interface is configured to connect a BM-SC control plane functionentity and a BM-SC user plane function entity. The communicationsinterface 801 may further include a communications interface configuredto connect to an application server.

The memory 803 stores a program or code. The memory 803 may include avolatile memory, for example, a random access memory (RAM), or mayinclude a non-volatile memory, for example, a flash memory, a hard diskdrive (HDD) or a solid-state drive (SSD). Alternatively, the memory 803may include a combination of the foregoing types of memories.

The processor 802 is a control center of the control plane functionentity, and connects parts of the entire control plane function entitythrough various interfaces and lines. The processor 802 may implement afunction in any embodiment shown in FIG. 3 to FIG. 5 by executing theprogram or the code in the memory 803.

The processor 802 may be formed by an integrated circuit (IC), forexample, may be formed by a single packaged IC, or may be formed byconnecting a plurality of packaged ICs having a same function ordifferent functions. For example, the processor may include only acentral processing unit (CPU), or may be a combination of a GPU, adigital signal processor (DSP), and a control chip (such as a basebandchip). In the implementations of this application, the CPU may be asingle computing core, or may include a plurality of computing cores.

Optionally, the processor 802 includes at least one processor, forexample, may include a first processor 8021 and a second processor 8022.The first processor 8021 is located in the BM-SC control plane functionentity, and the second processor 8022 is located in the MBMS-GW controlplane function entity.

Further, optionally, the memory 803 includes a first memory 8031 and asecond memory 8032. The first memory 8031 may be located in the BM-SCcontrol plane function entity, and is configured to store a program orcode used to perform a function of the BM-SC control plane functionentity; and the second memory 8032 may be located in the MBMS-GW controlplane function entity, and is configured to store a program or code usedto perform a function of the MBMS-GW control plane function entity.

Correspondingly, the first processor 8021 is configured to execute theprogram or the code in the first memory 8031, and the second processor8022 is configured to execute the program or the code in the secondmemory 8032, to implement functions of the BM-SC control plane functionentity and the MBMS-GW control plane function entity in any embodimentshown in FIG. 3 to FIG. 5.

This application further provides a communications system. The system isconfigured to implement the communication methods described in theforegoing embodiments. Further, the system includes: an applicationserver, a control plane function entity, and a target user planefunction entity.

The application server is configured to send a request message to thecontrol plane function entity, where the request message is used torequest to establish a session for a first service, the request messageincludes service information of the first service, and the serviceinformation includes at least one of broadcast area information andservice type information.

The control plane function entity is configured to: obtain acorrespondence between address information of a user plane functionentity and a user plane capability supported by the user plane functionentity, and receive the request message sent by the application server.

The control plane function entity is further configured to: determineaddress information of the target user plane function entity based onthe correspondence and the service information, and establish a sessionconnection to the target user plane function entity based on the addressinformation of the target user plane function entity.

The control plane function entity is further configured to send asession connection request to the target user plane function entity. Thetarget user plane function entity is configured to: receive the sessionconnection request sent by the control plane function entity, generate asession connection response based on the session connection request, andsend the session connection response to the control plane functionentity.

It should be noted that, the control plane function entity may be thecontrol plane function entity shown in FIG. 6, FIG. 7, or FIG. 8, anddetails are not described again.

This application further provides a computer storage medium, where thecomputer storage medium may store a program. When the program isexecuted, some or all of the steps in the embodiments of thecommunication method provided in this application may be included. Thestorage medium may be a magnetic disk, an optical disc, a read-onlymemory (ROM), a random access memory (RAM), or the like.

A person skilled in the art may clearly understand that, thetechnologies in the embodiments of the present application may beimplemented by software in addition to a necessary general hardwareplatform. Based on such an understanding, the technical solutions of thepresent application essentially or the part contributing to the priorart may be implemented in a form of a software product. The computersoftware product may be stored in a storage medium, such as a ROM/RAM, amagnetic disk, or an optical disc, and include instructions forinstructing a computer device (which may be a personal computer, aserver, a network device, or the like) to perform the methods describedin the embodiments or some parts of the embodiments of the presentapplication.

Same and similar parts between the embodiments in this specification maybe mutually referenced. Especially, wireless communications deviceembodiments are basically similar to the method embodiments, andtherefore are described briefly; for related parts, refer todescriptions in the method embodiments.

The implementations of the present application that are described aboveare not intended to limit the protection scope of the presentapplication.

What is claimed is:
 1. A method, comprising: obtaining, by a controlplane function entity, a correspondence between address information ofone or more user plane function entities and user plane capabilitiessupported by the one or more user plane function entities; receiving, bythe control plane function entity, a request message from an applicationserver, wherein the request message requests to establish a session fora first service, the request message comprises service information ofthe first service, and the service information comprises broadcast areainformation of the first service or service type information of thefirst service; determining, by the control plane function entity,address information of a target user plane function entity based on thecorrespondence and the service information, wherein determining, by thecontrol plane function entity, the address information of the targetuser plane function entity based on the correspondence and the serviceinformation comprises: determining, by the control plane functionentity, a user plane capability of the target user plane function entitybased on the service information; and searching, by the control planefunction entity, the correspondence based on the determined user planecapability of the target user plane function entity, to determine theaddress information of the target user plane function entity; andestablishing, by the control plane function entity, a session connectionto the target user plane function entity based on the addressinformation of the target user plane function entity.
 2. The methodaccording to claim 1, wherein the control plane function entitycomprises a broadcast multicast service center (BM-SC) control planefunction entity or a multimedia broadcast multicast system gateway(MBMS-GW) control plane function entity.
 3. The method according toclaim 1, wherein: the control plane function entity comprises abroadcast multicast service center (BM-SC) control plane function entityand a multimedia broadcast multicast system gateway (MBMS-GW)controlplane function entity; determining, by the control plane functionentity, the address information of the target user plane function entitybased on the correspondence and the service information comprises:determining, by the BM-SC control plane function entity, the addressinformation of the target user plane function entity based on thecorrespondence and the service information; and establishing, by thecontrol plane function entity, the session connection to the target userplane function entity based on the address information of the targetuser plane function entity comprises: sending, by the BM-SC controlplane function entity, a session start request to the MBMS-GW controlplane function entity, wherein the session start request comprises theaddress information of the target user plane function entity; andestablishing, by the MBMS-GW control plane function entity, a sessionconnection to the target user plane function entity based on the addressinformation of the target user plane function entity.
 4. The methodaccording to claim 1, wherein the control plane function entity is amultimedia broadcast multicast system gateway (MBMS-GW) control planefunction entity, and receiving, by the control plane function entity,the request message from the application server comprises: receiving, bythe MBMS-GW control plane function entity using a broadcast multicastservice center (BM-SC) control plane function entity, the requestmessage from the application server.
 5. The method according to claim 1,wherein the broadcast area information of the first service comprises acell identity (cell ID), a service area identifier (SAT), orgeographical location information; and the service type information ofthe first service comprises a mobile broadband (MBB) service, anInternet of Things (IoT) service, an ultra-reliable and low latencycommunications (URLLC) service, or a mission-critical push-to-talk(MCPTT) service.
 6. An apparatus, comprising: at least one processorcoupled with a non-transitory storage medium storing executableinstructions; wherein the executable instructions, when executed by theat least one processor, cause the at least one processor to: obtain acorrespondence between address information of one or more user planefunction entities and user plane capabilities supported by the one ormore user plane function entities; receive a request message from anapplication server, wherein the request message requests to establish asession for a first service, the request message comprises serviceinformation of the first service, and the service information comprisesbroadcast area information of the first service or service typeinformation of the first service; determine address information of atarget user plane function entity based on the correspondence and theservice information, wherein determining the address information of thetarget user plane function entity based on the correspondence and theservice information comprises: determining a user plane capability ofthe target user plane function entity based on the service information;and searching the correspondence based on the determined user planecapability of the target user plane function entity, to determine theaddress information of the target user plane function entity; andestablish a session connection to the target user plane function entitybased on the address information of the target user plane functionentity.
 7. The apparatus according to claim 6, wherein the apparatusimplements a broadcast multicast service center (BM-SC) control planefunction entity or a multimedia broadcast multicast system gateway(MBMS-GW) control plane function entity.
 8. The apparatus according toclaim₇, wherein: the apparatus implements a broadcast multicast servicecenter (BM-SC) control plane function entity and a multimedia broadcastmulticast system gateway (MBMS-GW) control plane function entity, the atleast one processor comprises a first processor and a second processor,the BM-SC control plane function entity is implemented by the firstprocessor, and the MBMS-GW control plane function entity is implementedby the second processor; the first processor is configured to: determinethe address information of the target user plane function entity basedon the correspondence and the service information, and send a sessionstart request to the MBMS-GW control plane function entity, wherein thesession start request comprises the address information of the targetuser plane function entity; and the second processor is configured toestablish a session connection to the target user plane function entitybased on the address information of the target user plane functionentity.
 9. The apparatus according to claim 6, wherein the apparatusimplements a multimedia broadcast multicast system gateway (MBMS-GW)control plane function entity, and the at least one processor isconfigured to receive a request message from an application server usinga broadcast multicast service center (BM-SC) control plane functionentity.
 10. The apparatus according to claim 6, wherein: the broadcastarea information of the first service comprises a cell identity (cellID), a service area identifier (SAT), or geographical locationinformation; and the service type information of the first servicecomprises a mobile broadband (MBB) service, an Internet of Things (IoT)service, an ultra-reliable and low latency communications (URLLC)service, or a mission-critical push-to-talk (MCPTT) service.
 11. Asystem, comprising: an application server; a control plane functionentity; and a target user plane function entity; wherein: theapplication server is configured to send a request message to thecontrol plane function entity, wherein the request message requests toestablish a session for a first service, the request message comprisesservice information of the first service, and the service informationcomprises broadcast area information of the first service or servicetype information of the first service; the control plane function entityis configured to: obtain a correspondence between address information ofone or more user plane function entities and user plane capabilitiessupported by the one or more user plane function entities, and receivethe request message from the application server; and determine addressinformation of the target user plane function entity based on thecorrespondence and the service information, wherein determining theaddress information of the target user plane function entity based onthe correspondence and the service information comprises: determining auser plane capability of the target user plane function entity based onthe service information; and searching the correspondence based on thedetermined user plane capability of the target user plane functionentity, to determine the address information of the target user planefunction entity; and establish a session connection to the target userplane function entity based on the address information of the targetuser plane function entity.
 12. The system according to claim 11,wherein: the control plane function entity is configured to send asession connection request to the target user plane function entity; andthe target user plane function entity is configured to: receive thesession connection request from the control plane function entity,generate a session connection response based on the session connectionrequest, and send the session connection response to the control planefunction entity.
 13. The system according to claim 11, wherein thecontrol plane function entity comprises at a broadcast multicast servicecenter (BM-SC) control plane function entity or a multimedia broadcastmulticast system gateway (MBMS-GW) control plane function entity. 14.The system according to claim 11, wherein: the control plane functionentity comprises a broadcast multicast service center (BM-SC) controlplane function entity and a multimedia broadcast multicast systemgateway (MBMS-GW) control plane function entity; the BM-SC control planefunction entity is configured to determine the address information ofthe target user plane function entity based on the correspondence andthe service information, and send a session start request to the MBMS-GWcontrol plane function entity, wherein the session start requestcomprises the address information of the target user plane functionentity; and the MBMS-GW control plane function entity is configured toestablish a session connection to the target user plane function entitybased on the address information of the target user plane functionentity.
 15. The system according to claim 11, wherein: the control planefunction entity is a multimedia broadcast multicast system gateway(MBMS-GW) control plane function entity; and the MBMS-GW control planefunction entity is configured to receive, using a broadcast multicastservice center (BM-SC) control plane function entity, the requestmessage from the application server.
 16. The system according to claim11, wherein: the broadcast area information of the first servicecomprises a cell identity (cell ID), a service area identifier (SAT), orgeographical location information; and the service type information ofthe first service comprises a mobile broadband (MBB) service, anInternet of Things (IoT) service, an ultra-reliable and low latencycommunications (URLLC) service, or a mission-critical push-to-talk(MCPTT) service.